A251053 Number of (n+1)X(6+1) 0..3 arrays with no 2X2 subblock having the sum of its diagonal elements greater than the absolute difference of its antidiagonal elements

12858, 56676, 114512, 262200, 521785, 1081183, 2129846, 4324677, 8753870, 18288333, 38813329, 84501947, 186769920, 419036143, 948331795, 2161174028, 4944248898, 11342696102, 26060422110, 59935245973, 137914961855

Offset

1,1

Comments

Column 6 of A251055

Links

R. H. Hardin, Table of n, a(n) for n = 1..210

Formula

Empirical: a(n) = 8*a(n-1) -25*a(n-2) +35*a(n-3) -7*a(n-4) -49*a(n-5) +77*a(n-6) -55*a(n-7) +20*a(n-8) -3*a(n-9) for n>12

Example

Some solutions for n=3
..0..0..0..0..0..0..1....3..3..3..3..3..3..3....0..0..0..0..3..0..3
..0..0..0..0..0..0..0....0..0..0..0..0..0..0....0..0..0..0..3..0..3
..0..0..0..0..0..0..0....2..0..0..0..0..0..0....0..0..0..0..3..0..3
..1..1..1..1..0..0..0....2..0..0..0..0..0..0....1..1..0..0..3..0..3

Crossrefs

Sequence in context: A246809 A204490 A218457 * A231457 A228675 A268851

Adjacent sequences: A251050 A251051 A251052 * A251054 A251055 A251056

Keyword

nonn

Author

R. H. Hardin, Nov 29 2014

Status

approved